class Car(object):
    condition = "new"
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg   = mpg

    def display_car(self):
        print "This is a %s %s with %s MPG."%(self.color,self.model,self.mpg)

    def drive_car(self):
        self.condition = "used"

class ElectricCar (Car):
    def __init__(self, model, color, mpg,battery_type):
        self.model = model
        self.color = color
        self.mpg   = mpg
        self.battery_type=battery_type

    def drive_car(self):
        self.condition  = "like new"

my_car=ElectricCar("DeLorean11", "silver1", 34,"molten salt")
print my_car.condition
my_car.drive_car()

print my_car.condition